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Cheap flights from Portland, Maine to London from $279

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to London departing on 8/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Portland, Maine to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 11:36 pm
LHR
-
PWM
20h 21m
1 stop
$671JetBlue
Wed, May 6 - Mon, May 11
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 11:36 pm
LHR
-
PWM
20h 21m
1 stop
$676JetBlue
Wed, May 6 - Mon, May 11
Scandinavian Airlines Logo
6:30 am - 9:35 am
PWM
-
LHR
22h 05m
2 stops
Scandinavian Airlines Logo
7:05 am - 12:43 am
LHR
-
PWM
22h 38m
2 stops
$689Scandinavian Airlines
Wed, May 6 - Mon, May 11
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
$691JetBlue
Sun, May 3 - Wed, May 6
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
$694JetBlue
Wed, May 6 - Mon, May 11
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 11:36 pm
LHR
-
PWM
20h 21m
1 stop
$701JetBlue
Sun, May 3 - Sun, May 17
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 am - 11:36 pm
LHR
-
PWM
16h 41m
1 stop
$711JetBlue
Fri, May 1 - Wed, May 6
Scandinavian Airlines Logo
6:30 am - 9:35 am
PWM
-
LHR
22h 05m
2 stops
Scandinavian Airlines Logo
7:05 am - 12:43 am
LHR
-
PWM
22h 38m
3 stops
$715Scandinavian Airlines
Wed, May 6 - Mon, May 11
JetBlue Logo
7:28 am - 8:45 pm
PWM
-
LHR
32h 17m
1 stop
JetBlue Logo
8:15 am - 11:36 pm
LHR
-
PWM
20h 21m
1 stop
$716JetBlue
Thu, Apr 30 - Sun, May 3
Scandinavian Airlines Logo
6:30 am - 9:35 am
PWM
-
LHR
22h 05m
2 stops
Scandinavian Airlines Logo
7:05 am - 12:43 am
LHR
-
PWM
22h 38m
2 stops
$718Scandinavian Airlines
Wed, May 6 - Mon, May 11

JetBlue flights from Portland, Maine to London Heathrow Airport

Our best JetBlue deals on Portland, Maine to London Heathrow Airport flight tickets
JetBlue
May 6
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
May 11
LHR8:15 amLondon Heathrow
20h 21m
1 stop
PWM11:36 pmPortland
$671
JetBlue
May 6
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
May 11
LHR8:15 amLondon Heathrow
20h 21m
1 stop
PWM11:36 pmPortland
$676
JetBlue
May 3
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
May 6
LHR11:55 amLondon Heathrow
16h 41m
1 stop
PWM11:36 pmPortland
$691

United Airlines flights from Portland, Maine to London Heathrow Airport

Our best United Airlines deals on Portland, Maine to London Heathrow Airport flight tickets
United Airlines
Apr 1
PWM4:28 pmPortland
14h 17m
1 stop
LHR11:45 amLondon Heathrow
Apr 16
LHR6:55 amLondon Heathrow
19h 45m
2 stops
PWM9:40 pmPortland
$721
United Airlines
Apr 1
PWM6:00 amPortland
19h 55m
2 stops
LHR6:55 amLondon Heathrow
Apr 16
LHR6:55 amLondon Heathrow
19h 45m
2 stops
PWM9:40 pmPortland
$725
United Airlines
May 6
PWM6:00 amPortland
10h 35m
1 stop
LHR9:35 pmLondon Heathrow
May 11
LHR6:50 amLondon Heathrow
16h 33m
2 stops
PWM6:23 pmPortland
$770

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to London Heathrow Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 3, 2026.
Use the filters below to find and compare flights from Portland, Maine to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 5/11

8:15 am-11:36 pm

1 stop20h 21m

$671

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 5/11

8:15 am-11:36 pm

1 stop20h 21m

$676

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:30 am-9:35 am

2 stops22h 05m

London Heathrow

Mon 5/11

7:05 am-12:43 am

2 stops22h 38m

$689

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 5/3

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Wed 5/6

11:55 am-11:36 pm

1 stop16h 41m

$691

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Mon 5/11

11:55 am-11:36 pm

1 stop16h 41m

$694

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 5/3

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Sun 5/17

8:15 am-11:36 pm

1 stop20h 21m

$701

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 5/1

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Wed 5/6

11:55 am-11:36 pm

1 stop16h 41m

$711

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:30 am-9:35 am

2 stops22h 05m

London Heathrow

Mon 5/11

7:05 am-12:43 am

3 stops22h 38m

$715

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 4/30

7:28 am-8:45 pm

1 stop32h 17m

London Heathrow

Sun 5/3

8:15 am-11:36 pm

1 stop20h 21m

$716

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 5/6

6:30 am-9:35 am

2 stops22h 05m

London Heathrow

Mon 5/11

7:05 am-12:43 am

2 stops22h 38m

$718

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Portland, Maine to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from Portland, Maine, with most prices found around $752. If you’re not able to fly to London Heathrow Airport in October, then January is your next best option. Flight prices from Portland, Maine to London Heathrow Airport during January average around $782.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $660. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $711.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Portland, Maine to London Heathrow Airport in the afternoon for as low as $613. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $694.

When to book flights from Portland, Maine to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland, Maine to London Heathrow Airport (PWM to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to London Heathrow Airport

Fastest flight time

9h 45m

Direct flights

None
The fastest flight from Portland, Maine to London Heathrow Airport takes 9h 45m
There are no direct flights from Portland, Maine to London Heathrow Airport. There are no popular flight routes from Portland, Maine to London Heathrow Airport.
Search flight deals

  • How far is Portland to London Heathrow by plane?

    The distance between Portland and London Heathrow is about 3170.3 mi. In terms of flight time, this usually takes a little over 9h 45m.

  • When did momondo last update prices for flights from Portland Airport to London Heathrow Airport?

    Prices for flights from Portland Airport to London Heathrow Airport refresh daily.

  • How many operators does momondo search for flights from Portland Airport to London Heathrow Airport?

  • How old do you have to be to fly from Portland Airport to London Heathrow Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Portland, Maine to London Heathrow Airport?

Best airlines flying from Portland, Maine to London Heathrow Airport

Compare and see reviews for airlines that fly from Portland, Maine to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $648Free CancellationRating
7.4
9,377 reviews
Search United Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Crawley
Stratford-upon-Avon
Hayes
Wembley
Dartford
Croydon
Brentwood
Harrow
Watford
Guildford
Stansted
Cobham
Folkestone
Romford

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Portland with this policy.

How can momondo help me find flights from Portland to London?

Once you have performed a search for Portland to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Portland and alert you when they change.

An easier way to manage your London Heathrow Airport trip

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